diff --git a/README-zh.md b/README-zh.md
index a3b6dc0..c642f40 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -162,7 +162,7 @@ console.log(math.multiply(a, b).toString())
 这个库还支持字符串表达式求值， 所以上边的可以写为：
 
 ```js
-console.log(math.eval('(3 - i) * i').toString())
+console.log(math.evaluate('(3 - i) * i').toString())
 //=> '1 + 3i'
 ```
 
diff --git a/README.md b/README.md
index 75b42dd..f2195b1 100644
--- a/README.md
+++ b/README.md
@@ -164,7 +164,7 @@ console.log(math.multiply(a, b).toString())
 The library also supports evaluating a string expression, so the above could be re-written as:
 
 ```js
-console.log(math.eval('(3 - i) * i').toString())
+console.log(math.evaluate('(3 - i) * i').toString())
 //=> '1 + 3i'
 ```